Cosmic Perspective Fundamentals
3rd Edition
ISBN: 9780134988504
Author: Bennett, Jeffrey O., Donahue, M. (megan), SCHNEIDER, Nicholas, Voit, Mark
Publisher: Pearson,
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Textbook Question
Chapter 8, Problem 7QQ
Choose the best answer to etch of the following. Explain your reasoning.
What do we need to measure in order to determine a star’s luminosity? (a) Apparent brightness and mass (b) apparent brightness and temperature (c) apparent brightness and distance
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Using MBH
=
6.6 × 10 Mo, calculate the below.
a. Find radius of the Schwarzschild sphere (Schwarzschild radius Rs). You
can calculated from the appropriate formula or just use the fact that for
an object of 1 solar mass Rs = 3 km.
b. Express Rs in km, in AU, in parsecs.
c. Using the distance to M87 and your result above, find angular radius of
the SMBH (Schwarzschild radius). Express it in arcseconds (") and micro-
arcseconds (pas)
d. Take the radius of Pluto's orbit equal to 40 AU and find its angular size
(in micro-arcseconds, pas) at the distance of M87.
State the definition for a parsec, and derive its value in terms of As- tronomical Units. Convert your answer for the value of the distance of a parsec in Astronomical Units into light years. Be sure to include a large and clearly labeled diagram showing how you arrived at your conclusions. Be sure to show all work!
Match each characteristic below to the appropriate stellar end state.
(Select W-White dwarf, N-Neutron star, B-Black hole. If the first is W and the rest N, enter
WNNNNNNN).
A) Has a mass no greater than 1.4 solar-masses.
B) Sometimes appears as a pulsar.
C) Size defined by its Schwarzschild radius.
D) In a binary system it can explode as a supernova.
E) Supported by electron degeneracy pressure.
F) Typically about the size of Earth.
G) Usually has a very strong magnetic field.
H) Viewed from afar, time stops at its event horizon.
Answer:
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Chapter 8 Solutions
Cosmic Perspective Fundamentals
Ch. 8 - Choose the best answer to each of the following....Ch. 8 - Prob. 2QQCh. 8 - Choose the best answer to etch of the following....Ch. 8 - Prob. 4QQCh. 8 - Choose the best answer to etch of the following....Ch. 8 - Prob. 6QQCh. 8 - Choose the best answer to etch of the following....Ch. 8 - Choose the best answer to etch of the following....Ch. 8 - Choose the best answer to etch of the following....Ch. 8 - Choose the best answer to etch of the following....
Ch. 8 - Choose the best answer to etch of the following....Ch. 8 - Choose the best answer to etch of the following....Ch. 8 - Prob. 13SEQCh. 8 - Prob. 14SEQCh. 8 - Explain all answers clearly, with complete...Ch. 8 - Explain all answers clearly, with complete...Ch. 8 - Prob. 17SEQCh. 8 - Prob. 18SEQCh. 8 - Prob. 19SEQCh. 8 - Prob. 20SEQCh. 8 - Explain all answers clearly, with complete...Ch. 8 - Prob. 22SEQ
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